Zhou Yan, Wan Jin-Zhong, Li Qun, Huang Jian-Bo, Zhang Sheng-Tian, Long Tao, Deng Shao-Po
Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China.
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China.
Huan Jing Ke Xue. 2020 Oct 8;41(10):4733-4739. doi: 10.13227/j.hjkx.202004139.
A total of 92 corn grain samples, around the Pb-Zn mining area in Southwest China, were collected to evaluate the contamination and health risk of heavy metals. Heavy metals including Pb, Zn, Cd, Cr, and Ni in samples were analyzed. A single factor pollution index and comprehensive pollution index were calculated to assess the quality of corn grains. The potential health risks to adults and children due to the intake of these heavy metals through consumption of crops were evaluated using the health risk index. The results showed that the average contents of Pb, Zn, Cd, Cr, and Ni in corn grains were 0.30, 23.75, 0.21, 1.33, and 1.15 mg ·kg, respectively, Among the metals, the content of Zn, Pb, Cd, Cr, and Ni exceeded the national food hygiene standards. The Nemero index of Pb, Cd, Cr, and Ni ranged from 4.32 to 9.07, indicating an extremely high level, whereas the contamination of Zn reached an alarming level. The assessment results of the comprehensive health risk index for the corn grains indicated that the contamination of heavy metals poses health risks to adults and children by food ingestion; moreover, the children were more sensitive to various heavy metals than the adults. Principle component analysis revealed that the first main component dominated the sources of Pb, Cd, Cr, and Ni, while the second main component, Zn, might have originated from sources different from the other heavy metals. Positive correlations were not observed between the heavy metals in corns and soils.
在中国西南部铅锌矿区周围共采集了92个玉米籽粒样本，以评估重金属的污染情况和健康风险。对样本中的铅、锌、镉、铬和镍等重金属进行了分析。计算了单因子污染指数和综合污染指数，以评估玉米籽粒的质量。使用健康风险指数评估了成年人和儿童因食用农作物摄入这些重金属而面临的潜在健康风险。结果表明，玉米籽粒中铅、锌、镉、铬和镍的平均含量分别为0.30、23.75、0.21、1.33和1.15 mg·kg。其中，锌、铅、镉、铬和镍的含量超过了国家食品卫生标准。铅、镉、铬和镍的内梅罗指数在4.32至9.07之间，表明污染程度极高，而锌的污染达到了警戒水平。玉米籽粒综合健康风险指数的评估结果表明，重金属污染通过食物摄入对成年人和儿童构成健康风险；此外，儿童对各种重金属比成年人更敏感。主成分分析表明，第一主成分主导了铅、镉、铬和镍的来源，而第二主成分锌可能来自与其他重金属不同的来源。玉米中的重金属与土壤中的重金属之间未观察到正相关。
